Vitamin B-Komplex | Energize: which supplements make sense?

The question of whether a vitamin B complex can boost energy is common, as B vitamins (B1, B2, B3, B5, B6, B7, B9, B12) are essential cofactors in energy metabolism. However, the evidence is clear: in individuals without a confirmed deficiency, supplementation does not provide additional energy. Randomized controlled trials (RCTs) show no significant energy improvement in healthy, well-nourished people. A blood test (e.g., holotranscobalamin for B12, serum folate) can identify a deficiency – especially relevant for vegans, those with gastrointestinal disorders, or those on medications like metformin or proton pump inhibitors. MyBody-X offers such biomarkers, but the clinical validity of DTC tests for individual B vitamins is limited. A generalized B complex without diagnostic testing is often unnecessary and may pose risks at high doses (e.g., B6 neurotoxicity). Supplementation is only sensible when a deficiency is confirmed or when there is increased need (pregnancy, aging, chronic stress). The 'energize' claim is largely marketing; actual effects depend on individual status. Evidence: human-moderate (RCTs show no benefit in healthy individuals).